fs/nilfs2/nilfs.h

   1 /*
   2  * nilfs.h - NILFS local header file.
   3  *
   4  * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19  *
  20  * Written by Koji Sato <koji@osrg.net>
  21  *            Ryusuke Konishi <ryusuke@osrg.net>
  22  */
  23
  24 #ifndef _NILFS_H
  25 #define _NILFS_H
  26
  27 #include <linux/kernel.h>
  28 #include <linux/buffer_head.h>
  29 #include <linux/spinlock.h>
  30 #include <linux/blkdev.h>
  31 #include <linux/nilfs2_fs.h>
  32 #include "the_nilfs.h"
  33 #include "sb.h"
  34 #include "bmap.h"
  35
  36 /*
  37  * nilfs inode data in memory
  38  */
  39 struct nilfs_inode_info {
  40         __u32 i_flags;
  41         unsigned long  i_state;         /* Dynamic state flags */
  42         struct nilfs_bmap *i_bmap;
  43         struct nilfs_bmap i_bmap_data;
  44         __u64 i_xattr;  /* sector_t ??? */
  45         __u32 i_dir_start_lookup;
  46         __u64 i_cno;            /* check point number for GC inode */
  47         struct address_space i_btnode_cache;
  48         struct list_head i_dirty;       /* List for connecting dirty files */
  49
  50 #ifdef CONFIG_NILFS_XATTR
  51         /*
  52          * Extended attributes can be read independently of the main file
  53          * data. Taking i_sem even when reading would cause contention
  54          * between readers of EAs and writers of regular file data, so
  55          * instead we synchronize on xattr_sem when reading or changing
  56          * EAs.
  57          */
  58         struct rw_semaphore xattr_sem;
  59 #endif
  60         struct buffer_head *i_bh;       /* i_bh contains a new or dirty
  61                                            disk inode */
  62         struct nilfs_root *i_root;
  63         struct inode vfs_inode;
  64 };
  65
  66 static inline struct nilfs_inode_info *NILFS_I(const struct inode *inode)
  67 {
  68         return container_of(inode, struct nilfs_inode_info, vfs_inode);
  69 }
  70
  71 static inline struct nilfs_inode_info *
  72 NILFS_BMAP_I(const struct nilfs_bmap *bmap)
  73 {
  74         return container_of(bmap, struct nilfs_inode_info, i_bmap_data);
  75 }
  76
  77 static inline struct inode *NILFS_BTNC_I(struct address_space *btnc)
  78 {
  79         struct nilfs_inode_info *ii =
  80                 container_of(btnc, struct nilfs_inode_info, i_btnode_cache);
  81         return &ii->vfs_inode;
  82 }
  83
  84 static inline struct inode *NILFS_AS_I(struct address_space *mapping)
  85 {
  86         return (mapping->host) ? :
  87                 container_of(mapping, struct inode, i_data);
  88 }
  89
  90 /*
  91  * Dynamic state flags of NILFS on-memory inode (i_state)
  92  */
  93 enum {
  94         NILFS_I_NEW = 0,                /* Inode is newly created */
  95         NILFS_I_DIRTY,                  /* The file is dirty */
  96         NILFS_I_QUEUED,                 /* inode is in dirty_files list */
  97         NILFS_I_BUSY,                   /* inode is grabbed by a segment
  98                                            constructor */
  99         NILFS_I_COLLECTED,              /* All dirty blocks are collected */
 100         NILFS_I_UPDATED,                /* The file has been written back */
 101         NILFS_I_INODE_DIRTY,            /* write_inode is requested */
 102         NILFS_I_BMAP,                   /* has bmap and btnode_cache */
 103         NILFS_I_GCINODE,                /* inode for GC, on memory only */
 104         NILFS_I_GCDAT,                  /* shadow DAT, on memory only */
 105 };
 106
 107 /*
 108  * commit flags for nilfs_commit_super and nilfs_sync_super
 109  */
 110 enum {
 111         NILFS_SB_COMMIT = 0,    /* Commit a super block alternately */
 112         NILFS_SB_COMMIT_ALL     /* Commit both super blocks */
 113 };
 114
 115 /*
 116  * Macros to check inode numbers
 117  */
 118 #define NILFS_MDT_INO_BITS   \
 119   ((unsigned int)(1 << NILFS_DAT_INO | 1 << NILFS_CPFILE_INO |          \
 120                   1 << NILFS_SUFILE_INO | 1 << NILFS_IFILE_INO |        \
 121                   1 << NILFS_ATIME_INO | 1 << NILFS_SKETCH_INO))
 122
 123 #define NILFS_SYS_INO_BITS   \
 124   ((unsigned int)(1 << NILFS_ROOT_INO) | NILFS_MDT_INO_BITS)
 125
 126 #define NILFS_FIRST_INO(sb)  (NILFS_SB(sb)->s_nilfs->ns_first_ino)
 127
 128 #define NILFS_MDT_INODE(sb, ino) \
 129   ((ino) < NILFS_FIRST_INO(sb) && (NILFS_MDT_INO_BITS & (1 << (ino))))
 130 #define NILFS_VALID_INODE(sb, ino) \
 131   ((ino) >= NILFS_FIRST_INO(sb) || (NILFS_SYS_INO_BITS & (1 << (ino))))
 132
 133 /**
 134  * struct nilfs_transaction_info: context information for synchronization
 135  * @ti_magic: Magic number
 136  * @ti_save: Backup of journal_info field of task_struct
 137  * @ti_flags: Flags
 138  * @ti_count: Nest level
 139  * @ti_garbage: List of inode to be put when releasing semaphore
 140  */
 141 struct nilfs_transaction_info {
 142         u32                     ti_magic;
 143         void                   *ti_save;
 144                                 /* This should never used. If this happens,
 145                                    one of other filesystems has a bug. */
 146         unsigned short          ti_flags;
 147         unsigned short          ti_count;
 148         struct list_head        ti_garbage;
 149 };
 150
 151 /* ti_magic */
 152 #define NILFS_TI_MAGIC          0xd9e392fb
 153
 154 /* ti_flags */
 155 #define NILFS_TI_DYNAMIC_ALLOC  0x0001  /* Allocated from slab */
 156 #define NILFS_TI_SYNC           0x0002  /* Force to construct segment at the
 157                                            end of transaction. */
 158 #define NILFS_TI_GC             0x0004  /* GC context */
 159 #define NILFS_TI_COMMIT         0x0008  /* Change happened or not */
 160 #define NILFS_TI_WRITER         0x0010  /* Constructor context */
 161
 162
 163 int nilfs_transaction_begin(struct super_block *,
 164                             struct nilfs_transaction_info *, int);
 165 int nilfs_transaction_commit(struct super_block *);
 166 void nilfs_transaction_abort(struct super_block *);
 167
 168 static inline void nilfs_set_transaction_flag(unsigned int flag)
 169 {
 170         struct nilfs_transaction_info *ti = current->journal_info;
 171
 172         ti->ti_flags |= flag;
 173 }
 174
 175 static inline int nilfs_test_transaction_flag(unsigned int flag)
 176 {
 177         struct nilfs_transaction_info *ti = current->journal_info;
 178
 179         if (ti == NULL || ti->ti_magic != NILFS_TI_MAGIC)
 180                 return 0;
 181         return !!(ti->ti_flags & flag);
 182 }
 183
 184 static inline int nilfs_doing_gc(void)
 185 {
 186         return nilfs_test_transaction_flag(NILFS_TI_GC);
 187 }
 188
 189 static inline int nilfs_doing_construction(void)
 190 {
 191         return nilfs_test_transaction_flag(NILFS_TI_WRITER);
 192 }
 193
 194 static inline struct inode *nilfs_dat_inode(const struct the_nilfs *nilfs)
 195 {
 196         return nilfs_doing_gc() ? nilfs->ns_gc_dat : nilfs->ns_dat;
 197 }
 198
 199 /*
 200  * function prototype
 201  */
 202 #ifdef CONFIG_NILFS_POSIX_ACL
 203 #error "NILFS: not yet supported POSIX ACL"
 204 extern int nilfs_acl_chmod(struct inode *);
 205 extern int nilfs_init_acl(struct inode *, struct inode *);
 206 #else
 207 static inline int nilfs_acl_chmod(struct inode *inode)
 208 {
 209         return 0;
 210 }
 211
 212 static inline int nilfs_init_acl(struct inode *inode, struct inode *dir)
 213 {
 214         inode->i_mode &= ~current_umask();
 215         return 0;
 216 }
 217 #endif
 218
 219 #define NILFS_ATIME_DISABLE
 220
 221 /* dir.c */
 222 extern int nilfs_add_link(struct dentry *, struct inode *);
 223 extern ino_t nilfs_inode_by_name(struct inode *, const struct qstr *);
 224 extern int nilfs_make_empty(struct inode *, struct inode *);
 225 extern struct nilfs_dir_entry *
 226 nilfs_find_entry(struct inode *, const struct qstr *, struct page **);
 227 extern int nilfs_delete_entry(struct nilfs_dir_entry *, struct page *);
 228 extern int nilfs_empty_dir(struct inode *);
 229 extern struct nilfs_dir_entry *nilfs_dotdot(struct inode *, struct page **);
 230 extern void nilfs_set_link(struct inode *, struct nilfs_dir_entry *,
 231                            struct page *, struct inode *);
 232
 233 /* file.c */
 234 extern int nilfs_sync_file(struct file *, int);
 235
 236 /* ioctl.c */
 237 long nilfs_ioctl(struct file *, unsigned int, unsigned long);
 238 int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *, struct nilfs_argv *,
 239                                        void **);
 240
 241 /* inode.c */
 242 extern struct inode *nilfs_new_inode(struct inode *, int);
 243 extern void nilfs_free_inode(struct inode *);
 244 extern int nilfs_get_block(struct inode *, sector_t, struct buffer_head *, int);
 245 extern void nilfs_set_inode_flags(struct inode *);
 246 extern int nilfs_read_inode_common(struct inode *, struct nilfs_inode *);
 247 extern void nilfs_write_inode_common(struct inode *, struct nilfs_inode *, int);
 248 struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root,
 249                          unsigned long ino);
 250 extern struct inode *nilfs_iget_for_gc(struct super_block *sb,
 251                                        unsigned long ino, __u64 cno);
 252 extern void nilfs_update_inode(struct inode *, struct buffer_head *);
 253 extern void nilfs_truncate(struct inode *);
 254 extern void nilfs_evict_inode(struct inode *);
 255 extern int nilfs_setattr(struct dentry *, struct iattr *);
 256 int nilfs_permission(struct inode *inode, int mask);
 257 extern int nilfs_load_inode_block(struct nilfs_sb_info *, struct inode *,
 258                                   struct buffer_head **);
 259 extern int nilfs_inode_dirty(struct inode *);
 260 extern int nilfs_set_file_dirty(struct nilfs_sb_info *, struct inode *,
 261                                 unsigned);
 262 extern int nilfs_mark_inode_dirty(struct inode *);
 263 extern void nilfs_dirty_inode(struct inode *);
 264
 265 /* super.c */
 266 extern struct inode *nilfs_alloc_inode_common(struct the_nilfs *);
 267 extern struct inode *nilfs_alloc_inode(struct super_block *);
 268 extern void nilfs_destroy_inode(struct inode *);
 269 extern void nilfs_error(struct super_block *, const char *, const char *, ...)
 270         __attribute__ ((format (printf, 3, 4)));
 271 extern void nilfs_warning(struct super_block *, const char *, const char *, ...)
 272        __attribute__ ((format (printf, 3, 4)));
 273 extern struct nilfs_super_block *
 274 nilfs_read_super_block(struct super_block *, u64, int, struct buffer_head **);
 275 extern int nilfs_store_magic_and_option(struct super_block *,
 276                                         struct nilfs_super_block *, char *);
 277 extern int nilfs_check_feature_compatibility(struct super_block *,
 278                                              struct nilfs_super_block *);
 279 extern void nilfs_set_log_cursor(struct nilfs_super_block *,
 280                                  struct the_nilfs *);
 281 extern struct nilfs_super_block **nilfs_prepare_super(struct nilfs_sb_info *,
 282                                                       int flip);
 283 extern int nilfs_commit_super(struct nilfs_sb_info *, int);
 284 extern int nilfs_cleanup_super(struct nilfs_sb_info *);
 285 int nilfs_attach_checkpoint(struct nilfs_sb_info *sbi, __u64 cno, int curr_mnt,
 286                             struct nilfs_root **root);
 287
 288 /* gcinode.c */
 289 int nilfs_gccache_submit_read_data(struct inode *, sector_t, sector_t, __u64,
 290                                    struct buffer_head **);
 291 int nilfs_gccache_submit_read_node(struct inode *, sector_t, __u64,
 292                                    struct buffer_head **);
 293 int nilfs_gccache_wait_and_mark_dirty(struct buffer_head *);
 294 int nilfs_init_gcinode(struct inode *inode);
 295 void nilfs_remove_all_gcinodes(struct the_nilfs *nilfs);
 296
 297 /* gcdat.c */
 298 int nilfs_init_gcdat_inode(struct the_nilfs *);
 299 void nilfs_commit_gcdat_inode(struct the_nilfs *);
 300 void nilfs_clear_gcdat_inode(struct the_nilfs *);
 301
 302 /*
 303  * Inodes and files operations
 304  */
 305 extern const struct file_operations nilfs_dir_operations;
 306 extern const struct inode_operations nilfs_file_inode_operations;
 307 extern const struct file_operations nilfs_file_operations;
 308 extern const struct address_space_operations nilfs_aops;
 309 extern const struct inode_operations nilfs_dir_inode_operations;
 310 extern const struct inode_operations nilfs_special_inode_operations;
 311 extern const struct inode_operations nilfs_symlink_inode_operations;
 312
 313 /*
 314  * filesystem type
 315  */
 316 extern struct file_system_type nilfs_fs_type;
 317
 318
 319 #endif  /* _NILFS_H */